1. Assistant Professor, Dept. of Science and Environmental Technology, Federal Center for Technological Education of Minas Gerais, Av. Amazonas, 5253, CEP 30.4121-169, Belo Horizonte, Minas Gerais, Brazil (corresponding author).
2. Professor, Dept. of Hydraulics and Sanitary Engineering, Univ. of São Paulo, Av. Trabalhador Sãocarlense, 400, CEP 13.566-590, São Carlos, São Paulo, Brazil.
3. Professor, College of Engineering, Mathematics and Physical Sciences, Univ. of Exeter, Harrison Building, North Park Rd., Exeter EX4 4QF, U.K.